<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片试图区域 -->
        <el-card>
            <!-- 警示区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader expand-trigger="hover" v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange" clearable></el-cascader>
                </el-col>
                <el-col>
                
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button size="mini" type="primary" :disabled="isButtonDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开项 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" @click="showInput(scope.row)" size="small">+New Tag</el-button>
                            </template>                            
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>

                <!-- 静态参数面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button size="mini" type="primary" :disabled="isButtonDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开项 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable  @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" @click="showInput(scope.row)" size="small">+New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>

        </el-card>

        <!-- 添加参数或属性对话框区域 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <!-- 选择按钮 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default({
    data() {
        return {
            //分类列表
            cateList: [],
            //用户在级联下拉菜单中选择的分类id
            selectedCateKeys: [],
            //配置级联菜单中数据如何展示
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //tab页签激活显示的页签项
            activeName: 'many',
            //用来保存动态参数数据
            manyTableData: [],
            //用来保存静态属性数据
            onlyTableData: [],
            //控制添加参数，属性对话框的显示和隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            //添加表单验证规则
            addFormRules: {
                attr_name: [{required: true, message: '请输入名称', trigger: 'blur'}]
            },
            //控制修改对话框的显示和隐藏
            editDialogVisible: false,
            //修改表单的数据对象
            editForm: {},
            //修改表单的验证规则对象
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有的商品分类列表
        async getCateList() {
            const { data:res } = await this.$http.get('categories');
            // 判断状态码
            if (res.meta.status !== 200) {
                return this.$message.error('获取分类数据失败');
            };
            //将数据列表赋值给cateList
            this.cateList = res.data;
            //保存总数据条数
            console.log(res.data)
        },
        // 级联选择框选中项的变化，会触发这个函数
        handleChange() {
            //如果用户选择的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return;
            }
           this.getParamsData();
        },
        // tab 页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData();
        },
        //获取参数的列表数据
        async getParamsData() {
            //证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                return;
            }
            //当用户在级联菜单选择内容改变时触发
            console.log(this.selectedCateKeys);
            // 发送请求，根据用户选择的三级分类和面板获取参数数据
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`,
                { params: {sel:this.activeName} }
            );
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败')
            };
            
            //将获取到的数据中的attr_vals字符串转换为数组
            res.data.forEach( item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                //添加一个bool值控制文本框的显示或隐藏
                item.inputVisible = false;
                //添加一个inputValue保存文本框以及添加按钮
                item.inputValue = '';
            });

            if (this.activeName === 'many') {
                //获取的是动态参数
                this.manyTableData = res.data;
            } else {
                // 获取的是静态页面
                this.onlyTableData = res.data
            };
            // console.log(res.data);
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams() {
            //当用户点击对话框中的确定时，效验表单
            this.$refs.addFormRef.validate(async valid => {
                //效验不通过则返回
                if (!valid) return;
                //效验通过 发送请求完成添加参数或属性
                const { data: res } = await this.$http.post(
                    `categories/${this.cateId}/attributes`,
                    {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    }
                );

                //判断状态码
                if (res.meta.status !== 201) {
                    return this.$message.error('添加', this.titleText + '数据失败')
                };
                this.$message.success('添加'+ this.titleText + '数据成功');
                this.addDialogVisible = false;
                this.getParamsData();
            })
        },
        // 点击按钮 展示对话框
        async showEditDialog(attr_id) {
            //查询当前参数信息
            const { data:res } = await this.$http.get(
                `categories/${this.cateId}/attributes/${attr_id}`,
                {
                    params: {attr_sel: this.activeName}
                }
            )

            if (res.meta.status !== 200) {
                return this.$message.error('获取参数失败')
            }
            this.editForm = res.data;
            this.editDialogVisible = true
        },
        //重置修改表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return;
                const { data:res } = await this.$http.put(
                    `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败');
                }
                this.$message.success('修改参数成功');
                this.getParamsData();
                this.editDialogVisible = false
            })
        },
        //根据id删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm(
                '此操作将永久删除 是否继续？',
                '提示',
                {
                    confirmButtonText: '确定',
                    cancleButton: '取消',
                    type: 'warning'
                }
            ).catch(err => err)

            //当用户取消操作
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除!')
            }

            //删除业务逻辑
            const { data:res } = await this.$http.delete(
                `categories/${this.cateId}/attributes/${attr_id}`
            )
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }

            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 对应文本框和按钮的事件添加处理函数
        handleInputConfirm(row) {
            //用户在文本框按下enter键或焦点离开时都会触发执行
            // 判断用户在文本框中输入的内容是否合法
            if (row.inputValue.trim().length === 0) {
                row.inputvalue = '';
                row.inputVisible = false;
                return;
            };

            // 如果用户输入了真实合法的数据，保存
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;

            this.saveAttrVals(row);
        },
        showInput(row) {
            //用户点击按钮时触发
            row.inputVisible = true;
            //$nextTick:在页面上元素被重新渲染之后，调用回调函数的代码
            this.$nextTick(_=>{
                //让文本框自动获得焦点
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        handleClose(index, row) {
            //删除对应索引的参数可选项
            row.attr_vals.splice(index, 1);
            //调用函数，完成保存可选项的操作
            this.saveAttrVals(row)
        },
        //封装 完成保存可选项的操作 函数
        async saveAttrVals(row) {
            // 封装函数，完成保存可选项的操作
            // 发送请求，保存参数细项
            const {data: res} = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join('')
                }
            );
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败');
            }
            this.$message.success('修改参数成功')
        }

    },
    computed: {
        //添加计算属性用来获取按钮禁用与否
        isButtonDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            };
            return false;
        },
        //获取选中的三级分类id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            };
            return null;
        },
        //动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
})
</script>

<style scoped>
    .cat_opt {
        margin: 15px 0;
    }
    .el-tag {
         margin: 10px;
    }

    .input-new-tag {
        width: 120px;
    }
</style>